JOB ROLE AUTOMOTIVE SERVICE TECHNICIAN - PSSCIVE Bhopal

JOB ROLE – AUTOMOTIVE SERVICE TECHNICIAN

Sector: Automotive

(Qualification Pack Code : ASC/Q1401)

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PSS Central Institute of Vocational Education

Shyamla Hills, Bhopal – 462013, Madhya Pradesh, India

_________________________________________________________

www.psscive.ac.in

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Unit – 3: Major Systems & Components of an

Automobile

Session 2: Engine and its Components

Content

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Title Slide No.

Session Objective 4

Introduction of Engine 5-9

Different components of

internal combustion

engine

10-28

Summary 29

Assignment 30

Session Objectives

1. The student will be Able to explain engine and

label its parts.

4

Introduction of Engine

5© PSS Central Institute of Vocational Education, Bhopal 2019

Engine is the heart of an automobile. Its role is very important.

It converts the chemical energy to mechanical energy. This

energy is utilized for vehicular movement.

6

Internal

combustion engine

External combustion

Engine

Types of Engine

7

Spark ignition

engine

Compression ignition

Engine

Internal Combustion Engine

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Spark-ignition engine

The spark-ignition (SI) engine uses a highly volatile fuel

which turns to vapor easily, such as gasoline or gasohol.

The fuel is mixed with air before

it enters the engine cylinders.

9

The compression-ignition

(diesel engine)In the compression-ignition engine or diesel engine, only

fresh air enters the cylinder, which is then compressed to a

very high temperature and pressure. The air is compressed

so much that its temperature goes up to 5380C (10000F) or

higher.


Components of IC engine

1. Cylinder: The cylinder of an

IC engine is considered as the

main body of the engine in

which piston reciprocates to

develop power. It has to

withstand very high pressures

(about 70 bar or 70 X105 Pa)

and temperatures (about

22000C) because there is direct

combustion inside the cylinder.

11

Components of IC engine2.Cylinderhead: The cylinder head closes one end

of the cylinder. It houses the inlet and exhaust

valves.

12

Components of IC Engine3. Piston and Piston Rings:- Piston is the heart of the

engine. The functions of the piston are to compress the

charge during compression stroke and to transmit the gas

force to the connecting rod and then to the crank during

power stroke.

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Components of IC Engine

4. Connecting Rod : It is usually a steel forging of circular,

rectangular, I-,T-, or H-section and is highly polished for

increased strength. Its small end forms a hinge and pin joint

with the piston and its big end is connected to the crank by

crank pin.



4. Connecting Rod : It is usually a steel forging of

circular, rectangular, I-,T-, or H-section and is highly

polished for increased strength. Its small end forms a

hinge and pin joint with the piston and its big end is

connected to the crank by crank pin.

15


5. Crank and Crankshaft: Both crank and crankshaft are

steel forged and machined to a smooth finish. The two are

held together by means of a key. Crankshaft is supported in

main bearings and has a heavy wheel, called flywheel, to

even out the fluctuations of torque.

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6. Piston Pin or Wrist Pin: The piston pin provides the

bearing for the oscillating small end of the connecting rod.

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7. Inlet Valve: This valve controls the admission of the

charge into the petrol engine or air into diesel engine during

suction stroke of the engine.

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8. Exhaust Valve. The removal of exhaust gases after doing

work on the piston, is controlled by this valve.

9. Valve Spring. The valves are kept closed by the valve

springs.

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10. Inlet Manifold : It is the passage which carries the

charge from carburetor to the petrol engine or only air to the

diesel engine.

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11. Exhaust Manifold. It is the passage which carries the

exhaust gases from the exhaust valve to the atmosphere.

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12. Camshaft. The function of the cam shaft is to

operate the intake and exhaust valves through the cams,

cam followers, push rods and rocker arms.

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13. Cam and Cam follower. It is made of a required

profile to give desired motion to the valve through the

follower.

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14. Push Rod and Rocker Arm. The motion of the cam is

transmitted to the valve through the push rod and rocker

arm. These links together are also known as valve gear.

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15. Crank case. It is the base which holds the

cylinder and crankshaft. It also serves as the sump

for the lubricating oil.

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16. Flywheel: It is a wheel mounted on the crankshaft

which stores the energy during the power stroke and

transmits the energy through transmission to the wheels

when the clutch is engaged.

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Components of IC Engine17. Carburetor : The function of the carburetor is to supply

the uniform air-fuel to the cylinder of a petrol engine

through the intake manifold.

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18. Spark Plug. The function of the spark plug is to ignite

the mixture after completing the compression in the petrol

engine. It is generally mounted in the cylinder head. This

is only used in petrol engine.

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19. Fuel Injector. The function of fuel injector is to

break up the oil into fine spray (atomized condition)

as it enters the cylinder of diesel engine.

Summary

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In this session, you have learnt about the Engine and its

various components .Engine is the heart of an automobile. Its

role is very important. It converts the chemical energy to

mechanical energy. This energy is utilized for vehicular

movement. There are different ways of igniting fuel in an auto

engine.

Internal combustion (IC) external combustion engines

Automotive engines are called internal-combustion (IC)

engines because the fuel that runs is burned internally or

inside the engine.

Project Coordinator : Dr. Saurabh Prakash

Assistance

Er. Kuber Singh , Consultant

Joint Director

PSS Central Institute of Vocational Education

Shyamla Hills, Bhopal – 462013 , Madhya Pradesh, India

__________________________________________________________________________E-mail: [email protected]

Tel. +91 755 2660691, 2704100, 2660391, 2660564

Fax +91 755 2660481

Website: www.psscive.ac.in


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JOB ROLE AUTOMOTIVE SERVICE TECHNICIAN - PSSCIVE Bhopal